## Algebra 2 Common Core

Geometric with a common ratio of $0.4$.
Check if there is a common ratio by diving each pair of consecutive terms: $\dfrac{4}{10}$ $=0.4$; $\dfrac{1.6}{4}$ $=0.4$ ; $\dfrac{0.64}{1.6}$ $=0.4$. The ratio is constant so the sequence is geometric. The common ratio is $0.4$.